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South Central MN | Try to get them to produce more. They seem to die rather quickly then. Kind of like alfalfa in a hay field, you want it and it dies, don't want it and it is the most persistent plant ever.
Going to guess 2-4-D + Roundup would weaken them a bunch if it doesn't kill them, might have to go with a stiff dose. Otherwise just dig them out. Some perennials are pretty hard to kill with just one shot of a herbicide. | |
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